'<template> 
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="@/assets/image/logo2.png" alt="图片加载失败！">
        <span>电商后台管理系统</span>
      </div>
       <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
    <el-aside :width="isCollapse ? '64px' : '200px'">
      <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
    <el-menu background-color="#333744" text-color="#fff" active-text-color="#409EFF" unique-opened :collapse=" isCollapse" :collapse-transition="false" :router="true" :default-active="activePath">
       <!-- 一级菜单 -->
       <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
          <!-- 一级菜单模板区域 -->
        <template slot="title">
          <!-- 图标 -->
          <i :class="item.icon"></i>
          <!-- 文本 -->
          <span>{{item.authName}}</span>
        </template>

        <!-- 二级菜单 -->
        <el-menu-item :index="subItem.path+''" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState(subItem.path+'')">
          <!-- 二级菜单模板区域 -->
          <template slot="title">
          <!-- 图标 -->
          <i class="el-icon-menu"></i>
          <!-- 文本 -->
          <span>{{subItem.authName}}</span>
        </template>

        </el-menu-item>

      </el-submenu>

    </el-menu>

      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <!-- 路由占位符 -->
        <keep-alive>
           <router-view></router-view>  
        </keep-alive>      
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data(){
    return {
      //模拟后台数据
       menulist:[
         {
           id:1,
           authName:'用户管理',
           children:[{id:11,authName:'用户列表', path:'/users'}],
           icon:'iconfont icon-users'
         },
         {
           id:2,
           authName:'权限管理',
           children:[{id:21,authName:'角色列表',path:'/roles'},{id:22,authName:'权限列表',path:'/rights'}],
           icon:'iconfont icon-tijikongjian' 
         },
         {
           id:3,
           authName:'商品管理',
           children:[{id:31,authName:'商品列表',path:'/list'},{id:32,authName:'分类参数',path:'/params'},{id:33,authName:'商品分类',path:'/type'}],
           icon:'iconfont icon-shangpin'
         },
         {
           id:4,
           authName:'订单管理',
           children:[{id:41,authName:'订单列表', path:'/orders'}],
           icon:'iconfont icon-danju-tianchong'
         },
         {
           id:5,
           authName:'数据统计',
           children:[{id:51,authName:'数据列表', path:'/data'}],
           icon:'iconfont icon-baobiao'
         }
       ],
       //是否折叠
       isCollapse:false,
       //被激活的链接地址
       activePath:''
    }
  },
  created(){
  //  this.getMenuList();
     this.activePath = window.sessionStorage.getItem('activePath');
  },
  methods:{
    logout(){
      window.sessionStorage.clear();
      this.$router.push('/login');
    },
   //获取所有的菜单
  //   async getMenuList(){
  //   const {data:res} = await this.axios.get('menus');
  //   if(res.meta.status !== 200) return this.$message.error(res.meta.msg);
  //   this.menulist = res.data;
  //  }

  //点击按钮，切换菜单的折叠与展开
    toggleCollapse(){
      this.isCollapse = !this.isCollapse;
   },
   //保存链接的激活状态
   saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath);
      this.activePath = activePath;
   }
 }
}
</script>

<style scoped>
/* ============================ */
.el-header{
  background-color:#373d41;
  display:flex;
  justify-content:space-between;
  padding-left:0;
  align-items: center;
  color:#FFF;
  font-size:20px;
}
.el-header img{
  width:90px;
  height:60px;
}
.el-header div{
  display:flex;
  align-items: center;
}
.el-header span{
  margin-left:10px;
}
/* ================================= */
.el-aside{
  background-color:#333744;
}
.el-menu{
  border-right:none;
}
.toggle-button{
  background-color:#4A5064;
  color:#FFF;
  font-size:12px;
  line-height:24px;
  text-align:center;
  /* letter-spacing: 0.2em; */
  cursor:pointer;
}
/* ===================================== */
.el-main{
  background-color:#EAEDF1;
}
.home-container{
  height:100%;
}
.iconfont{
  margin-right:10px;
}
</style>'